If she can convince them to do that, a new vista of medical opportunities opens up, including better toxicity tests and even more replacement organs.

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The drug had caused muscle toxicity in earlier tests, but Tally's team changed the dosage and minimized the problem.

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Further trials of this compound are on hold because the drug caused cardiac toxicity at high doses in animal tests.

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Because of the indirect mechanism of its toxicity and its specificity for human cells, the contaminant had been undetectable in both the standard, sophisticated screening tests that are supposed to assure a drug's purity and quality, and in studies in animals.

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